\begin{tikzpicture}[>=Stealth]
    \draw [->] (-7,0) -- (7.2,0);
    \foreach \x in {-6,...,6} {
        \draw (\x,0.3) -- (\x,0);
    }

    \foreach \x in {-6.5,...,5.5} {
        \draw (\x,0.2) -- (\x,0);
    }

    \foreach \pos/\text in {-5/-5, -2.5/-2.5, 0/0, 1/+1, 4.5/+4\frac{1}{2}} {
        \filldraw [fill=black] (\pos, 0) circle (0.05) node [below] {$\text$};
    }
\end{tikzpicture}
